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Represents the amount of increase (decrease) in equity accounts due to shares acquired from exercise of call options.

No definition available.

Name:	exh_AdjustmentsToEquitySharesAcquiredFromExerciseOfCallOptions
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Number of shares related to shares acquired from exercise of call options.

No definition available.

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Number of shares related to stock issued as a result of the exercise of warrants.

No definition available.

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Represents the amount of increase (decrease) in equity accounts due to stock issued as a result of the exercise of warrants.

No definition available.

Name:	exh_AdjustmentsToEquityStockIssuedDuringPeriodValueWarrantsExercised
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Amount of increase (decrease) in equity accounts due to redemption of convertible debt.

No definition available.

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Number of shares issued during the period as a result of a redemption of convertible debt.

No definition available.

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Represents adjustments to other comprehensive income resulting from the sale of partnership units or other changes in ownership in the Partnership.

No definition available.

Name:	exh_OtherComprehensiveIncomeAdjustmentsFromChangesInOwnershipOfPartnership
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Represents the amortization of the deferred gain (loss) that is recognized upon the discontinuation of an interest rate cash flow hedge over the original term of the instrument.

No definition available.

Name:	exh_OtherComprehensiveIncomeAmortizationOfDeferredGainLossOnDiscontinuationOfInterestRateCashFlowHedge
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Represents the increase in equity resulting from the sale of equity of a subsidiary.

No definition available.

Name:	exh_SaleOfSubsidiaryStock
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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock and other employee benefit plans but exclude the exercise of stock options and stock issued under employee stock purchase plans.

No definition available.

Name:	exh_StockIssuedDuringPeriodSharesShareBasedCompensationPlans
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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

No definition available.

Name:	us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
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This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

No definition available.

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.

No definition available.

Name:	us-gaap_StockholdersEquityOther
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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of shares related to Restricted Stock Award forfeited during the period.

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Number of share options (or share units) exercised during the current period.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Value of stock issued as a result of the exercise of stock options.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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